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Sato Masaki

Sato Masaki (2021)

Sato Masaki (佐藤優樹) is a Japanese pop singer and idol managed by Up-Front Promotion and was formerly a part of Hello! Project. She is a former tenth generation member of Morning Musume.


  • Name: Sato Masaki (佐藤優樹)
  • Nickname: Masaki (まさき), Maachan (まーちゃん), Masa (まさ), Masaking (まさキング)
  • Birthdate: May 7, 1999 (1999-05-07) (age 25)
  • Birthplace: Hokkaido, Japan
  • Blood Type: A
  • Height: 156cm
  • Hobbies: Playing drums, riding horses
  • Specialties: Piano, ballet
  • Favorite Food: Soba, udon, plum sheets
  • Favorite Color: Yellow, green
  • Looks Up To: Niigaki Risa, Takahashi Ai
  • Hello! Project groups:


Sato Masaki was selected from Morning Musume's 10th Generation audition to join the group on September 29, 2011, along with Iikubo Haruna, Ishida Ayumi, and former Hello! Pro Egg Kudo Haruka.

The tenth generation made their official presentation on the same day they were announced as new members in the "Morning Musume Concert Tour Fall 2011 Ai Believe ~Takahashi Ai Graduation Memory Special~" concert, and they participated in a performance of the song "Tomo".

In June 2019 Masaki revealed that she began attending college sometime in April 2019, making her the first Morning Musume member to continue being active in the group while going to university.

On February 21, 2021 Sato was absent from an event due to severe stomach pain. The following day it was announced that Sato had been diagnosed with irritable bowel syndrome and would continue to be absent from performances while awaiting test results arriving the 26th. Announcements for her further break from activities involving performing or standing for long periods of time was made on April 27th, and a third update fans to her continued absence was given on June 3rd.

While still on break from performing due to her illness, Sato announced her graduation from Morning Musume and Hello! Project on September 24, 2021, to take place at Nippon Budokan during the "Morning Musume '21 Concert Teenage Solution ~Sato Masaki Sotsugyou Special~" on December 13th. A final single featuring Sato would also be released before the end of the year. The announcement stated that though she found some relief from her illness with a change of diet and medication she was still unable to participate in activities, especially performing, at a level to her satisfaction, and she felt it may have been causing trouble for the other members and staff. She chose to graduate to focus on improving her health first, instead of continuing in the group at a time when she could not reliably make plans for the future. She expressed her desire to continue a solo music career after her graduation in both the announcement and her personal blog.



Digital Singles

Video Releases



Sankaku no Garasu prism

  • [2018.10.26] Sankaku no Garasu (三角の硝子; Triangular Glass)
  • [2022.02.28] prism

Morning Musume 9・10ki 1st official Photo Book Alo Hello! Morning Musume 10ki Photobook Morning Musume 15th Anniversary Photobook ZERO Hello Pro Visual Photobook 2020 AUTUMN Vol.1 Hello Pro Visual Photobook 2021 SPRING Vol.5 Hello Pro Visual Photobook 2021 Autumn Vol.9 Morning Musume 9, 10ki 10th Anniversary BOOK



TV Programs
TV Dramas




  • Her official Morning Musume image color was emerald green.
  • She is the sixth Morning Musume member to come from Hokkaido, after Ishiguro Aya, Iida Kaori, Abe Natsumi, Konno Asami, and Fujimoto Miki.
  • Her favorite word is "deshou" (でしょう; "right?").
  • Her motto is "Don't be noisy".
  • Her philosophy is "being smiley".
  • She believes she can't lose at having perfect pitch.
  • She is left-handed.
  • Has played the piano since she was 2 years old.
  • Played the drums starting in her third year of elementary school, but stopped two years ago as of 2012.
  • Is practiced to competition level obstacle jumping in horse back riding.
  • Considers her charm point to be her eyelashes.
  • Noted her favorite Morning Musume song to be "Maji Desu ka Ska!" in 2011, and "Fantasy ga Hajimaru" in 2012.
  • Calls her father "Chichi" (父父) instead of "Papa" or "Otousan" (お父さん).
  • Has two younger sisters.
  • Has said that if she were not a member of Morning Musume, she would want to be a piano teacher.
  • Spoke English until she was 5 years old, when she began kindergarten and had to start speaking Japanese. She grew up watching Disney Channel shows in English, and still does, despite no longer understanding the language.
  • Notably called Tanaka Reina "Tanasatan" (たなさたん).
  • Her favorite genre of music is J-Pop.

External Links